>We could just as easily say having any passcode on your phone at all is obstruction of justice, since the feds could want to look on your phone for whatever made up reason, and if they can't because its encrypted, well why did you do that? What are you trying to hide? Evidence of a crime!?!?!

I specifically said this wouldn't be covered, because you set up the pin before you knew any investigation occurred. However, I think it's reasonable if you were pulled aside by CBP while deplaning, and while you're waiting to interview you decided to hastily turn on encryption on your laptop, or eat a bunch of papers you had on you, I'd say that's similar to evidence tampering, not unlike flushing drugs down the toilet when you see a cop pulling up on your driveway.